/**
 * MINAPL Compiler.
 * Copyright 2012 Michael A. Muller
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#ifndef _minapl_Tokenizer_h_
#define _minapl_Tokenizer_h_

#include <stdio.h>

#include "Token.h"

namespace minapl {

struct Tokenizer {
    int lineNum;
    const char *sourceName;
    FILE *fp;

    Token nextTok;

    Tokenizer(const char *sourceName, FILE *fp) :
        sourceName(sourceName), fp(fp), lineNum(1) {
    }

    /**
    * Tokens are:
    * '.*' - string
    * whitespace/comment
    * \W+ -
    * EO
    */
    void getToken(Token *tok);

    void putBack(Token *token);

    int getLineNum() const {
        if (nextTok.type != TOK_INVAL)
            return nextTok.lineNum;
        else
            return lineNum;
    }

private:
    void scanToken(Token *tok);
};


}

#endif
